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Re: [perl #133152] Cygwin build failure with v5.27.11-16-g71e845c342

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From:
Achim Gratz
Date:
April 30, 2018 18:29
Subject:
Re: [perl #133152] Cygwin build failure with v5.27.11-16-g71e845c342
Message ID:
87lgd4mtty.fsf@Rainer.invalid
Dave Mitchell writes:
> On Tue, Apr 24, 2018 at 05:18:24PM -0700, Tony Cook (via RT) wrote:
>> $ make locale.o
>> gcc -c -DPERL_CORE -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -D_FORTIFY_SOURCE=2 -std=c89 -O3 -Wall -Werror=declaration-after-statement -Werror=pointer-arith -Wextra -Wc++-compat -Wwrite-strings locale.c
>> In file included from /usr/include/ssp/stdlib.h:4:0,
>>                  from /usr/include/stdlib.h:338,
>>                  from perl.h:819,
>>                  from locale.c:49:
>> /usr/include/ssp/wchar.h:78:1: error: conflicting types for ‘fgetws’
>>  __ssp_decl(wchar_t *, fgetws, (wchar_t *__restrict __buf, int __wlen, FILE *__restrict __fp))
>>  ^
>> In file included from locale.c:54:0:
>> /usr/include/wchar.h:228:10: note: previous declaration of ‘fgetws’ was here
>>  wchar_t *fgetws (wchar_t *__restrict, int, __FILE *__restrict);
>>           ^~~~~~
>
> Do you know any of:
>
>  * what the ssp/ include files are for,

That's an implementation detail of how the fortified versions of those
functions are provided.  AFAIK, ssp == stack smashing protection.

>  * why they have alternate definitions of fgetws etc,

That's what you get when fortification is requested.

>  * why perl redefining a bunch of stdio macros cause both versions to be
>    included?

You'd have to ask someone who knows the details of how the feature test
macros work, probably Yaakov Selkowitz.  And no, I don't think you
should redefine any macros that are already existing.


Regards,
Achim.
-- 
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